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Re: [openpgp] OpenPGP SEIP downgrade attack

Jon Callas <jon@callas.org> Wed, 07 October 2015 22:21 UTC

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From: Jon Callas <jon@callas.org>
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Date: Wed, 07 Oct 2015 15:21:23 -0700
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References: <56128436.40607@assured.se> <87y4fh4210.fsf@vigenere.g10code.de> <9A043F3CF02CD34C8E74AC1594475C73F4B28383@uxcn10-5.UoA.auckland.ac.nz> <87k2r04hak.fsf@vigenere.g10code.de> <9A043F3CF02CD34C8E74AC1594475C73F4B2C5B4@uxcn10-5.UoA.auckland.ac.nz> <87si5m1ncm.fsf@vigenere.g10code.de>
To: Werner Koch <wk@gnupg.org>
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Cc: "cfrg@mail.ietf.org" <cfrg@mail.ietf.org>, "openpgp@ietf.org" <openpgp@ietf.org>, "cryptography@metzdowd.com" <cryptography@metzdowd.com>, Jon Callas <jon@callas.org>, Peter Gutmann <pgut001@cs.auckland.ac.nz>, Jonas Magazinius <jonas.magazinius@assured.se>
Subject: Re: [openpgp] OpenPGP SEIP downgrade attack
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> On Oct 7, 2015, at 12:37 PM, Werner Koch <wk@gnupg.org> wrote:

> OCB works with all 128 bit block length ciphers and is faster than GCM.

So does CCM, and CCM has no intellectual property issues, nor GCM's brittleness.

	Jon

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